Metallic hose.



K. SCHNEIDER.

METALLIC HOSE. APPLICATION FILED 0019, 1314.

1,200,533. Patented OCI. 10,1916.

sTATEs PATENT oEEIoE.

KARL scHNEIDER, 0E PFORZHEIM, GERMANY, AssIGNoR To EMIL WITZENMANN, 0E PFORZHEIM, GERMANY.

METALLIC HosE.

Specification of Letters Patent.

Patented Oct. 10, 191.6.

To r//ZZ whom t may concern A Y Be it known that I, KARL SCHNEIDER, a subject of the German Emperor, and resident of Oestliche Karl- Friedrich strasse 184, Pforzheim, in the German Empire, have invented an Improved and `Novel Metallic Hose, of which the following is a specification.' u y I This invention relates in general to a metallic hose in which the tightness increased by means of a specialv cylindrical helix wound over and upon the windings of the appropriately shaped metal strip or band forming the hose at the place or rim where the outer part or rim of a winding takes over, and presses upon, vthe inner part or rim 'of the adjacent winding," this pressure being now considerably increased by that of said special helix whereby the tightness of the hose is correspondingly improved. v

In particular my invention relates to metal hoses of the kind, in which one of the two rims of the metal strip or band, viz. that remaining at the outside of the finished hose, is so shaped that a packing can be inserted between the overlapping metal parts, the rim in question forming a groove which is situated just opposite to the outer surface of the inner part or half of the metal strip or band, and is adapted to receive said packing which thus is under the mutual pressure of the hose-forming metal parts. Now, the arrangement of the said special helix is such that it presses the grooved part with its packing upon the flat metal part of the winding below it, whereby the tightness is increased in such a measure that the hose may be employed also for fluids which are under a comparatively greatpressure. In order to maintain this great tightness even if the hose is bent in curves of short radius, the special helix is so connected with the grooved part mentioned that no lrelative axial movement or displacement can occur, as will become more clear from the accompanying drawing which shows a part of my improved hose partly in side view and partly in longitudinal section.

A is the metal band which forms in its sectional shape an inner rim al and an outer rim o2. More accurately the outer rim consists of two parts a2 o3, of which the latter forms a groove containing a packing o. This packing is located between the parts a3 and al of the band A, and it is subjected not only to the own pressure of the wound band A in general, or of the parts L2 a3 in particular, but also to the pressure of a separate `helix B wound just upon the part or groove@3 and pressing it against the packingb which, of course, is pressed in its turn against the part or rim al. The strength of the helix B is, of course, appropriately chosen. It may be wound upon the grooved part or rim a3 either simultaneously with winding the band A, z'. c. forming the hose, or upon the wound band, z'. e. upon the thus far finished hose. rlhe sectional shape of the rim part a3 may be different from that shown, as may also the shape of the helix wire at its inner surface where it is in contact with said rim part a3, but at any rate the shape of the two parts in question must be such that an axial displacement of the Ahelix B with respect to the hose A is completely prevented.

If the hose is intended for conducting a hot fluid, such, for instance, as steam, the helix B is preferably made of a metal having a lesser coefficient of expansion than has the metal which the hose proper is made of. For instance, iron may be chosen for the hose proper in such a case, but bronze for the helix B.

The inner diameter of the helix B, when this latter is in proper position upon the hose, corresponds, of course, exactly to the outer diameter of the hose at the place a3, but if the helix would, or could be removed, it would somewhat contract; the difference represents the tension with which the helix presses upon the packing at the place a3. The outer diameter of the helix B is preferably at least the same as that of the hose at the place a2, or a little more, so that the hose proper is secured against external friction.

Having now fully described my invention arranged as to be adapted to compress said packing between said overlapping parts.

2. In a metal hose, the combination with the hose proper, of a helix so arranged as to be adapted to press the overlapping hose parts against each other; said helix consisting of a metal having a lesser coeilicient of expansion than has the hose metal.

3. A hose consisting of a sheet metal strip formed spirally with each convolution lapping and interlocking with the convolution adjacent thereto, and a packing between the overlapping parts of the convolutions, in combination with a spring helix formed around the overlapping parts of the convolutions to cause them to press the packing against the underlapping parts of the convolutions.

4. A hose consisting of a sheet metal strip formed spil-ally with each convolution lapping` and interlocking with the convolution adjacent thereto, and a packing between the overlapping parts of the convolutions, in combination with a spring helix formed around the overlapping parts of the convolutions to cause them to press the packing against the under-lapping parts of the convolutions, and the inner face of said helix and the coperating outer face of the strip being shaped to prevent the axial displacement of the hose and helix.

5. A hose consisting of a sheet metal strip formed spirally with each convolution lapping and interlocking with the convolution adjacent thereto, and a packing between the overlapping parts of the convolutions, in

combination with a spring helix formed around the overlapping part of the convolutions to cause them to press the packing against the underlapping parts of the convolutions, and the outer diameter of the helix being approximately equal to the outer diameter of the hose proper.

6. A hose consisting of a sheet metal strip formed spirally with each convolution la ping and interlocking with a convolution adjacent thereto, and a helix wound over and upon the windings of the metal strip at the place where the outer part of its winding takes over7 and the inner face of said helix and the outer face of the hose proper having interlocking portions to prevent axial displacement of the hose proper and helix.

In Witness whereof I have hereunto signed my name this fifteenth day of September,

1914, in the presence of two subscribing witnesses.

KARL SCHNEIDER.

Witnesses:

ALBERT E. VAN HOUTEN, GEORGE ZINK.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of atents, Washington, D. C. 

